12947665 has 4 divisors (see below), whose sum is σ = 15537204. Its totient is φ = 10358128.

The previous prime is 12947651. The next prime is 12947681. The reversal of 12947665 is 56674921.

12947665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56674921 = 23 ⋅2464127.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 10804369 = 1464^2 + 3287^2 .

It is a cyclic number.

It is not a de Polignac number, because 12947665 - 2¹¹ = 12945617 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294762 + ... + 1294771.

It is an arithmetic number, because the mean of its divisors is an integer number (3884301).

Almost surely, 2^12947665 is an apocalyptic number.

It is an amenable number.

12947665 is a deficient number, since it is larger than the sum of its proper divisors (2589539).

12947665 is an equidigital number, since it uses as much as digits as its factorization.

12947665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589538.

The product of its digits is 90720, while the sum is 40.

The square root of 12947665 is about 3598.2863977177. The cubic root of 12947665 is about 234.8175133763.

The spelling of 12947665 in words is "twelve million, nine hundred forty-seven thousand, six hundred sixty-five".